Classification of Elements and Periodicity in Properties
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the formula of the compound formed between silicon and chlorine?

Si (group 14, valence 4) and Cl (group 17, valence 1) form \(\ce{SiCl4}\), a covalent compound, by sharing electrons to complete octets.

\(\ce{SiCl}\)
\(\ce{SiCl2}\)
\(\ce{SiCl4}\)
\(\ce{Si2Cl4}\)
3

Which element has the lowest electronegativity?

Electronegativity decreases down a group and increases across a period. Among F, Cl, K, and Cs, Cs (group 1, period 6) has the lowest value.

F
Cl
Cs
K
3

Which of the following shows a diagonal relationship with Li?

Diagonal relationships occur between second and third period elements (e.g., Li and Mg) due to similar size and electronegativity, unlike Na, K, or Be.

Na
K
Be
Mg
4

Which element in the second period has the least tendency to form ionic bonds?

Ionic bonding decreases across a period as electronegativity increases. F (group 17, electronegativity 4.0) prefers covalent bonds, unlike Li, Be, or B.

Li
Be
F
B
3

Arrange the following elements in order of decreasing electron affinity: F, Cl, Br, I.

Electron affinity decreases down group 17, with Cl highest due to optimal size and nuclear charge, followed by F (anomaly due to repulsion). Order: Cl > F > Br > I.

I > Br > F > Cl
Cl > F > Br > I
F > Cl > Br > I
Br > I > Cl > F
2

Which element exhibits a diagonal relationship with carbon?

C (group 14, period 2) has a diagonal relationship with Si (group 14, period 3) due to similar properties, unlike B, N, or P.

B
N
P
Si
4

Which of the following elements was predicted as Eka-boron by Mendeleev?

Mendeleev predicted Eka-boron below B in group 13, later identified as Ga, with similar properties to B, unlike Sc (group 3), Ge (group 14), or Tc (group 7).

A. Ga
B. Ge
C. Tc
D. Sc
1

Which of the following sulfates has the highest solubility in water due to its hydration energy?

Solubility of group 2 sulfates decreases down the group as hydration energy drops with increasing cation size. \(\ce{BeSO4}\) (smallest cation) has the highest solubility.

\(\ce{MgSO4}\)
\(\ce{BeSO4}\)
\(\ce{CaSO4}\)
\(\ce{SrSO4}\)
2

Which element in group 14 has the highest tendency to exhibit catenation?

Catenation (self-linking) is strongest for C due to its small size and strong C-C bond energy, far exceeding Si, Ge, or Sn in group 14.

C
Si
Ge
Sn
1

What is the general outer electronic configuration of group 2 elements?

Group 2 elements (alkaline earth metals) have 2 valence electrons, with outer configuration \(ns^2\).

\(ns^1\)
\(ns^2 np^1\)
\(ns^2 np^2\)
\(ns^2\)
4

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